Trying to figure out what installation kit I need for my 10-Bolt 8,5 in front axle. Find a lot of different installation and overhaul kits. Should I better take an overhaul kit rather then an installation kit? Actually I just want to change my gear ratio, but when I have my axles open...thinking of doing an overhaul, shouldn't be bad - right? And what is the difference between an open / posi carrier style??